Hardware Hacking

Simple trick to extend receive range to 40.00 - 59.99 MHz:

1/ Power the radio off
2/ Power on whilst holding in the CALL / CH. SP. button

That’s it! To go back to 50.00 - 53.99 just repeat the above steps.

1.) Remove control head from front of the rig.
2.) Disconnect the cable that connects to the back of the control head.
3.) Four screws hold on the back cover of the control head. Remove them
and the back cover.
4.) Clip the red and blue wires inside the control head. Then, put the rig
back together.
5.) Hold the Function key down on power-up to reset the rig.
6.) You will loose the contents of the rigs memories when you perform this
mod, so be prepared to reprogram them.

I researched how alinco has
done their mods on their other radios and I found they usually have a
red and blue wire which opens up the TX. The DR-605T only has a blue
wire. After removing mine I found that the radio can now transmit from
135 to 173 and from 400 to 499 (into a Dummy load). I make no promises.
You’re completely on your own, and this probably voids the warranty.

Steps:

1. Remove the top cover (four screws).

2. Hold the radio face down on a cloth.

3. If you look down inside the front cover you can see the single blue
wire. It attaches to the surface of the board with two solder joints.
Remove the jumper.

4. Replace the top cover.

5. Hold down the function key and repower the radio. This resets the
computer and you will lose your memory channels.

Remember it is illegal to transmit out of the band that the radio was
type classified for…

Mod 1 - Activate 108 - 142 MHz and 810 - 998 MHz Receive
——————————————————–

Remove head unit from radio and open it up.

Inside you will see a red and blue wire.

Cut the red wire.

Open the main unit and attach a wire to CN-205. This will be
your antenna for 810-998 MHz.

Close everything up.

Reset the CPU by holding down the FUNC key while you turn the
radio on.

To use:
The VHF key toggles between 108-142 and 2m. This toggle
only works in VFO mode.

The UHF key toggles between 810-998 and 70cm. This toggle
only works in VFO mode.

Mod 2 - Extened tx/rx on 2m and 70cm
————————————

Remove head unit from radio and open it. (2 screws on back)

Inside you will see a red and a blue wire.

Cut the blue wire.

Put everything back together.

Reset the CPU by holding down the FUNC key while you turn
the radio on.

You can now transmit and receive on the following freqs:
130-174MHz and 400-517MHz

Be carefull!!!!! You can now transmit outside of the HAM
bands. Don’t do this! If you do you WILL get caught and
the FCC loves those $10,000 fines.

If you take off the removeable
front panel and remove the two phillips screws holding
the front panel together, you will find two junper wires (one red,
the other blue). Cut both jumpers and reset (funct + power).
Remember to write down all your memories. You will find that the radio
will recieve on 108.00 to 142.990 AM on the vhf side and 850.000
to 909.9875 on the uhf side. To activate the (EXTRA OPTIONS), just press the
VHF and also the UHF BAND buttons twice. With each press, you will
activate either the normal or the EXPANDED band capabilities of the
radio. It’s nice when a Ham creates a rig to do things for other Hams.
Look Ma, no special wiring or soldering to do.
just cut some jumpers and away you go.
Just remember, no transmitter operations on frequencies you are not allowed!